Creates an executive-mode device and assigns the logical name
    DECW$DISPLAY to point to it. This qualifier must be used with
    the /CREATE qualifier. Devices created with the /EXECUTIVE_MODE
    qualifier are deleted only in the following situations:

    o  They are explicitly deleted with the /DELETE qualifier.

    o  The system is rebooted.

    To modify or delete executive-mode devices, you must have SYSNAM
    (system logical name) privilege.